INSTRUMENT MEDICAL POUR UTILISATION AVEC DES LIQUIDES

MEDICAL INSTRUMENT FOR USE WITH LIQUIDS

Abrégé anglais

The medical instrument for the application of liquids
to teeth includes a handle portion and a treating portion,
the treating portion comprising a highly elastic sponge. In
a preferred embodiment, the treating portion is connected to
the handle portion by a ball joint. The use of a sponge
allows an optimum application of the liquid on and in
cavities without leaving residual material. The presence of
a ball joint allows a safe treatment also in locations that
are difficult to access otherwise.

Revendications

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I claim:
1. A medical instrument for use with liquids, more
particularly for the application of liquids to teeth and for
removing excess liquids, comprising a handle portion and a
treating portion, wherein said handle portion comprises a
highly elastic sponge.
2. The instrument of claim 1, wherein said sponge is
attached to one end of a holder of the treating portion
while the other end of the holder is connected to the handle
portion by means of a ball joint.
3. The instrument of claim 2, wherein said holder is
removably connected to said handle portion.
4. The instrument of claim 1, wherein one end of said
handle portion is provided with a ball and the other end of
said holder is provided with a ball socket for receiving
said ball.
5. The instrument of claim 9, wherein said ball socket
comprises a slot.
6. The instrument of claim 1, wherein said holder is made
of plastics material.
7. The instrument of claim 1, wherein the end of said
holder carrying said sponge is tapered.

Description

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MEDICAL INSTRUMENT FOR USE WITH LIQUIDS
Field of the Invention
The present invention refers to a medical instrument
for use with liquids, more particularly for the application
of liquid synthetic materials to teeth, comprising a handle
portion and a treating portion.
Background of the Invention
A number of denta.L instruments are known which are
used for the application of synthetic materials for dental
fillings, the materials genera.Lly being liquids such as a
primer or bonding agent. Such materials are used in the
elaboration of composite fil:Lings, and the instruments of
the prior art for this purpose comprise a treating portion
provided with a brush. The use of brushes in clinical
applications is neither simple, nor does it satisfy the
demands. They carry either_ i~oo much or not enough liquid,
and it is difficult to reach undercut areas as well as the
important approximolateral dentine portion on the cervical
shoulder. The use of fleecy, hirsute applicators is not
satisfactory either.
Mainly in the case of liquids requiring a high wetting
degree, wetting faults due to the formation of air bubbles
or an oxygen inhibition of the polymerization can be avoided
if thinning is counteracted by means of the air blower.
U.S.Patent No. 5,119,803 discloses a disposable
medicinal applicator and gum massage tip for massaging the
gum area. The conical end port~~on of the tip is formed of an
absorbent sponge material. However, the tip member is
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resilient enough for the massaging action. Therefore, it is
not useable for applying a fluid on teeth and removing the
excess fluid therefrom.
The tip of the massaging instrument of U.S. Patent No.
4,653,480 is made of a .rubber-:Like material and has no
sponge-like function.
Summary of the Invention
On the background of thi;> prior art, it is an object
of the present invention to provide a medical instrument,
more particularly a dental insi~rument for the application of
liquids, that ensures a more efficient application and
leaves less excess material. This object is attained by an
instrument wherein the treating portion comprises a sponge.
A safe treatment of locat=ions that are difficult to
reach is ensured in a preferre<~ embodiment of the invention
wherein the sponge is attached to one end of a holder of the
treating portion while the other end of the holder is
connected to the handle portlOrl by means of a ball joint.
Further embodiments and advantages are defined in the
further dependent claims.
Brief Description of the Drawings
The invention will be explained in more detail
hereinafter with reference to drawings of embodiments
thereof.
FIG. 1 shows a side view of an instrument of the
invention;
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FIG. 2 shows the treating portion of the instrument
of FIG. 1 in a side view;
FIG. 3 shows the treating portion of FIG. 2 in a
bottom view; and
FIG. 4 shows an alternative embodiment of the
treating portion in a side view.
Detailed Description of the Invention
A first exemplifying embodiment of the instrument of
the invention is illustrated in FIGS. 1 to 3. The
instrument comprises a handle portion 1 and a treating
portion 2, these two portions being connected to each other
by a ball joint 3. Treating portion 2 consists of a holder
4, e.g. of plastics material, one end of which is provided
with a ball socket 5 and the other end with a sponge 6, the
latter being cemented, according to the present example, to
a supporting disk 7. As known per se in the field of tool
manufacture, ball socket 5 is hollow and comprises an
opening 8 for the insertion of ball 9 of the handle portion.
Furthermore, the rim of the ba7_1 socket is provided with a
slot 15 allowing to turn the treating portion in the
opposite direction of the holder as well.
The handle portion is generally made of metal and
capable of being sterilized, and it comprises a handle 10 of
plastics material for an easy manipulation of the
instrument. The treating portion is designed as a
disposable part that is removed from the handle portion and
discarded after the treatment.
FIG. 4 shows an alternative embodiment of the treating
portion that may also be manufactured from plastics
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material, one end of holder 12 being provided with the same
ball socket 5 as in the preceding embodiment while the other
end 13 is tapered in order to carry a sponge 14.
Alternatively, it is also possible to use a cylindrical pin.
For the sponge, a high.Ly absorbent material is used
whose shape provides a good adaptation to the existing
structures. Also, a sponga_ is capable of absorbing a
relatively large amount of liquid without losing it on the
way to the location of the application, i.e. without
dripping. At the location of the application, the sponge is
compressed by applying a pressure, thereby releasing the
liquid as desired. In particular, the use of a sponge
provides a good access to :locations that are difficult to
access otherwise and an optimum wetting in these locations,
thereby offering an increased safety.
As the sponge is removed from the location of the
application, excess material applied will be absorbed due to
its expansion, thereby avoiding the formation of unnecessary
residual quantities.
The use of a ba_L1 joint allows applications in
inaccessible locations such as e.g. in a distal box or on a
shoulder that would only be reliably accessible by a
counter-angularly arranged instrument otherwise. For menial
areas, as well as in the area ~~f the front teeth, a straight
positioning may be helpful, i.e. a position where the holder
is in line with the handle portion. In undercut locations
such as excavations, the sponge ensures an improved
application due to its expansi~~n in. the cavity.
Preferably, the surface c~f the sponge should be smooth
and free of incisions or edges, and it should be highly
absorbent independently of the viscosity of the liquid, as
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well as highly elastic in order to require only small
forces.
The possible applications of such an instrument are
not limited to the field of tooth fil_~ings. Thus, an
instrument of this kind may also be used in the medical
field, e.g. for applications in microsurgery for bleeding
bone or tissue porticns.
The sponge applicator of the invention may also be
used for the application of other liquids or gels of all
kinds, e.g. for the local application of fluorides or
bleaching gels.
Furthermore, the possible embodiments are not limited
to the illustrated arid described ones. Thus, it is possible
to exchange the functions of t:he ball and the socket, i.e.
to provide the ball at t=he end of the holder and the socket
at the end of the handle portion. Also, sponges of various
other shapes may be attached t:o the holder, and the holder
itself may have other dimentsions a:nd .shapes than the
conical, the cylindrical, or t:he illustrated disk shape.
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